package com.itheima;

import java.util.Scanner;
public class HomeWork7 {
        public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            System.out.println("请输入身份证号：");
            String id = sc.nextLine();
            System.out.println(check(id));
        }

        public static boolean check(String id) {
            if (id == null) {
                return false;
            }
            if (id.startsWith("0")) {
                return false;
            }
            if (id.length() != 18) {
                return false;
            }
            for (int i = 0; i < id.length(); i++) {
                char ch = id.charAt(i);
                if (i == id.length() - 1) {
                    if (ch < '0' || ch > '9' && ch != 'X') {
                        return false;
                    }
                } else {
                    if (ch < '0' || ch > '9') {
                        return false;
                    }
                }
            }
            return true;
        }
    }
